import java.util.List;
import java.util.Optional;

/**
 * Test case for rule #2: "Never use Optional.get() unless you can prove that the Optional is
 * present."
 */
public class Marks2 {

    class Customer {
        int getID() {
            return 42;
        }

        String getName() {
            return "Fozzy Bear";
        }
    }

    String customerNameByID(List<Customer> custList, int custID) {
        Optional<Customer> opt = custList.stream().filter(c -> c.getID() == custID).findFirst();
        // :: error: (method.invocation.invalid)
        return opt.get().getName();
    }
}
